Electrical heating device



Sept. 25,1923. 1,468,722

B. W. MACY ELECTRICAL HEATING DEVICE Filed May 6. 1922 2:1 Barnet kw Mack fitter mag Patented Sept. 25, 1923.

UNITED" STATES BARNETT WRIGHT MACY, OF JACKSONVILLE, FLORIDA.

ELECTRICAL HEATING DEVICE.

Application filed lay 6, 1922. Serial No. 559,017.

To all whom it may concern:

Be it known that I, BARNETT Wxrorm MACY, a citizen of the United States, residing at Jacksonville, in the county of Duval and State of Florida, have invented certain.

new and useful Improvements in Electrical Heating Devices, of which the following is a specification.

My said invention relates to-an improved electric heating device for water and otherliquids and it is an object of the same to provide a heating device of the character described which shall contain a continuous heating element of great length and which shall be adapted to contact directly with the liquid for imparting heat thereto, the heating element itself, however, not being raised to the very high, temperature customary in devices of this character.

A further object of the invention is to provide a' device of the character described adapted to heat a large volume of liquid but which shall consist of few parts and be of simple construction so as to be readily'taken apart for repairs or other purposes.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,

80 Figure 1 is a side elevation of my device with parts broken awayto show the interna construction, and

Figure 2 is a horizontal section of Figure 1.

In the drawings reference character 10 indicates an outer casing of any convenient material between which and an inner casing 11 is a space filled with a packing of asbestos or like material indicated at 12. Within the inner casing is a cylinder of insulating material 13 to prevent contact of the conductors with the casing. A core 14 of porcelain or analogous material occupies the central space and is provided with a series of vertical outer grooves separated by ribs 15. The ribs preferably fit closely within the insulating cylinder 13 and thus form a circular series of separate compartments communicating at the upper and lower ends with 5 upper and lower spaces 16 and 17 respectively. A conductor 18 composed preferably of a helically coiled wire is connected at the upper end to a fuse 19 and at the lower end to a terminal 20, the conductor passing from the terminal 20 up the adjacent groove then to the left and down the next groove, then to the left and upward in the next groove and so on around the core, the last upwardly extending part being connected to the fuse 19.

A rodf21 extends through the-core and is threaded at both ends to receive nuts 22 and 23 which engage closely againstthe ends of the core to holdv the parts in place. Beneath the core is a space 17 and underneath the space there are located a pair of disks 24 and 25 separated by a packing 26 and having a central opening through which extends a sleeve 27. ,The rod 21 extends through the sleeve 27 and nuts 28 separated from the disks by insulating washers 29, hold the disks in position relative to the remainingparts. A terminal 30 is secured to the rod by nuts at the lower end and serves for connection of an insulated wire 31, this wire passing through an opening at the lower end of casing 10 from which it is insulated by a bushing consisting of a hollow stud 32 having a nut 33 threaded thereon.

The terminal 20 is secured to a bolt 34 which at its lower-end carries a terminal 35 secured to a conductor 36 also passing through the casing 10 and insulated therefrom.

The casing 10 has a lateral inlet) 37 for liquid, this inlet leading to the space 17 and an outlet 38 leads outwardly from the space 16 for egress of the heated liquid. It will be seen that the liquid can enter the space 17 and pass upwardly through the multiple passages about the core to the space 16 whence it passes through the outlet 38. During its progress past the branches of the conductor 18 it takes up heat from the conductor and it will be seen that while the temperature-of the conductor is not abnormally high there is a large surface exposed to the. liquid by reason of the fact that the conductor is first coiled in small coils throughout its length and then the coiled wire thus formed is helically coiled into larger convo lutions throughout the length of each passage and preferably of a size to fit rather closely therein. In addition to this I may arrange the coils of wire so close together that the current can pass horizontally from convolution to convolution or vertically from coil to coil thus exerting further heating action on the liquid. The material of the conductors is selected to have a resistance substantially the same as the liquid or a little lower, so that the current can pass when the level of liquid falls low enough to expose the fuse this will burn out without injury to the conductor. The fuse is of course formed of such material and dimensions as will best serve the purpose indicated.

Having thus fully described my said invention, what I claim as new and desire to secure-by Letters Patent, is:

1. A liquid heating device comprising a casing, a core within the casing provided with a plurality of vertically extendin grooves in the periphery of the casing saiil grooves being separated by ribs which extend outwardly from the core to a point adjacent the casing, substantially asset forth.

2.. A liquid heating device comprising a cylindricaldouble-walled casing having insulation between its walls, a substantially cylindrical core within the casing provided with outwardly extending ribs which are adapted to contact with the inner wall of said double-walled casing and to thereby form a circular series of separate compartments adjacent the said inner wall, substantially as set forth.

3. A liquid heating device comprising a casing, a core within the casing formed with a circular series of separate grooves in the periphery of the casing, a heating wire within the grooves said wire being first coiled in small coils throu hout its length and then helically coiled into larger convolutions, and means for passing a liquid into contact with the said heating wire, substantially as set forth.

4. A liquid heating device comprising a cylindrical double-walled casing having insulation between its walls at the sides, top and bottom, a core within the casing spaced from the top and bottom thereof and provided with a plurality of outwardly projecting ribs contacting with the inner of 7 said double walls and forming a circular series of separate passages extending the length of the core, a heating element within the said passages, andmeans for passing a liquid into the casing, into contact with the heating element and then outwardly from the casing, substantially as set forth.

5. In combination, a double-walled casing having a packing between its walls at the sides and ends, inlet and outlet passages therefor, a core located between said passages and providing a plurality of longitudinally extending passages, and a single conductor extending successively through said passages, substantially as set forth.

6. In combination, a double-walled casing having insulation between its walls at the sides and ends, inlet and outlet passages therefor, a core located between said passages and providing a plurality of longitudinally extending passages, a single conductor extending successively through said passages, a rod extending through said core and serving to hold the same in place, and a fuse connecting the rod to one. end of said conductor, substantially as set forth.

7 In combination, a cylindrical casin a cylindrical core having passages lea ing from end to end thereof, inlet and outlet passages on the casing connected to the passages in the core, a central rod of conducting material extending through the core and through the bottom of the casing, and

a conductor extending successively throu 11 said passages and connected at one end to t e upper end of said rod, substantially as set forth. v

8. A liquid heating device comprisin a casing, a core within the casing provided with a plurality of vertically extending grooves separated from each other, a heating wire within the grooves said wire being first coiled in small coils throughout its length and then helically coiled into larger convolutions, substantially as set forth.

In witness whereof I have hereunto set my hand and seal at Jacksonville, Florida, this 25th day of April, A. D. nineteen hundred and twenty-two.

BARNETT WRIGHT MACY. [L.s.]

Witnesses:

W. M. MOYLAN, Es'rmm GATLIN. 

